To the extent that you are on a meta-search engine or other aggregator of information that is a third-party to the airlines (e.g. one step removed from the carrier itself) you should be okay. The systems generally pull from a GDS (global distribution system) on a read-only basis. Now, if you are searching for the fare on the carrier-owned system itself, then it would certainly be possible for them to implement a system such as the one you are talking about. That being said, carriers also know that basing system-wide travel pricing on a single user’s search query can be inefficient, so even if such systems were implemented, you’d sooner see it variable pricing effective for an individual user vs. globally. That’s why some sites recommend clearing your browser cache, shifting your IP address, etc. to get the best fare.
Credit:stackoverflow.com‘